<template>
  <div class="app-container">
    <h2 style="text-align: center">发布新课程</h2>
    <el-steps
      :active="1"
      process-status="wait"
      align-center
      style="marginbottom: 40px"
    >
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="最终发布" />
    </el-steps>
    <el-form label-width="120px">
      <el-form label-width="120px">
        <el-form-item label="课程标题">
          <el-input
            v-model="courseInfo.title"
            placeholder=" 示例：机器学习项目课：从基础到搭建项目视频课程,专业名称注意大小写"
          ></el-input>
        </el-form-item>
        <!-- 所属分类 TODO -->
        <!-- 一级分类 -->
        <el-form-item label="课程类别">
          <el-select
            v-model="courseInfo.subjectParentId"
            placeholder="一级分类"
            @change="subjectLevelOneChanged"
          >
            <el-option
              v-for="subject in subjectOneList"
              :key="subject.id"
              :label="subject.title"
              :value="subject.id"
            />
          </el-select>
          <!-- 二级分类 -->
          <el-select v-model="courseInfo.subjectId" placeholder="二级分类">
            <el-option
              v-for="subject in subjectTwoList"
              :key="subject.value"
              :label="subject.title"
              :value="subject.id"
            />
          </el-select>
        </el-form-item>

        <!-- 课程讲师 TODO -->
        <el-form-item label="课程讲师">
          <el-select v-model="courseInfo.teacherId" placeholder="请选择">
            <el-option
              v-for="teacher in teacherList"
              :key="teacher.id"
              :label="teacher.name"
              :value="teacher.id"
            />
          </el-select>
        </el-form-item>
        <el-form-item label="总课时">
          <el-input-number
            :min="0"
            v-model="courseInfo.lessonNum"
            controls-position="right"
            placeholder="请填写课程的总课时数"
          />
        </el-form-item>
        <!-- 课程简介 TODO -->
        <!-- 课程简介-->
        <el-form-item label="课程简介">
          <tinymce :height="300" v-model="courseInfo.description" />
        </el-form-item>
        <!-- 课程封面 TODO -->
        <!-- 课程封面-->
        <el-form-item label="课程封面">
          <el-upload
            :show-file-list="false"
            :on-success="handleAvatarSuccess"
            :before-upload="beforeAvatarUpload"
            :action="BASE_API + '/eduoss/fileoss'"
            class="avatar-uploader"
          >
            <img :src="courseInfo.cover" />
          </el-upload>
        </el-form-item>
        <el-form-item label="课程价格">
          <el-input-number
            :min="0"
            v-model="courseInfo.price"
            controls-position="right"
            placeholder="请填写课程价格"
          ></el-input-number>
        </el-form-item>
        <el-form-item>
          <el-button
            :disabled="saveBtnDisabled"
            type="primary"
            @click="saveOrUpdate"
            >保存并下一步</el-button
          >
        </el-form-item>
      </el-form>
    </el-form>
  </div>
</template>
<script>
import course from "@/api/edu/course";
import subject from "@/api/edu/subject";
import Tinymce from "@/components/Tinymce";
export default {
  components: { Tinymce },
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      courseInfo: {
        title: "",
        subjectId: "", //二级分类id
        subjectParentId: "", //一级分类id
        teacherId: "",
        lessonNum: 0,
        description: "",
        cover: "/static/ad3.jpg",
        price: 0,
      },
      courseId: "",
      teacherList: [], //用于封装所有讲师
      subjectOneList: [], //一级分类
      subjectTwoList: [], //二级分类
      BASE_API: process.env.BASE_API, // 接口API地址
    };
  },
  created() {
    this.init();
    //初始化所有讲师
    this.getListTeacher();
    //初始化一级分类
    this.getOneSubject();
  },
  watch: {
    $route(to, from) {
      this.init();
    },
  },
  methods: {
    init() {
      if (this.$route.params && this.$route.params.id) {
        this.courseId = this.$route.params.id;
        //调用根据id查询课程的方法
        this.getInfo();
      }
      this.courseInfo = {};
      this.courseInfo.cover = "/static/ad3.jpg";
    },
    //根据课程id查询课程信息
    getInfo() {
      course.getCourseInfoId(this.courseId).then((reponse) => {
        //在crouseInfo课程基本信息,包含一级分类id和二级分类id
        this.courseInfo = reponse.data.courseInfoVo;
        //1查询所有的分类,包含一级和二级
        subject.getSubjectList().then((reponse) => {
          //获取所有的一级部分
          this.subjectOneList = reponse.data.list;
          //把所有的一级分类数组进行遍历,比较当前courseInfo里面一级分类id和所有的一级分类id是否一样
          for (var i = 0; i < this.subjectOneList.length; i++) {
            var oneSubject = this.subjectOneList[i];
            if (this.courseInfo.subjectParentId == oneSubject.id) {
              //获取一级中所有的二级分类
              this.subjectTwoList = oneSubject.children;
            }
          }
        });
        //初始化所有讲师
        this.getListTeacher();
      });
    },
    //上传封面成功调用的方法
    handleAvatarSuccess(res, file) {
      console.log(res); // 上传响应
      console.log(URL.createObjectURL(file.raw)); // base64编码
      this.courseInfo.cover = res.data.url;
    },
    //上传之前调用的方法
    beforeAvatarUpload(file) {
      const isJPG = file.type === "image/jpeg";
      const isLt2M = file.size / 1024 / 1024 < 2;
      if (!isJPG) {
        this.$message.error("上传头像图片只能是 JPG 格式!");
      }
      if (!isLt2M) {
        this.$message.error("上传头像图片大小不能超过 2MB!");
      }
      return isJPG && isLt2M;
    },
    //点击某个一级分类,触发change,显示对应的二级分类
    subjectLevelOneChanged(value) {
      //value就是一级分类的id值
      //   alert(value);
      //   console.log(value);
      for (var i = 0; i < this.subjectOneList.length; i++) {
        //每个一级分类
        var oneSubject = this.subjectOneList[i];
        //判断:所有一级分类id和点击一级分类id是否一样
        if (value === oneSubject.id) {
          this.subjectTwoList = oneSubject.children;
          //把二级分类的值清空
          this.courseInfo.subjectId = "";
        }
      }
    },
    //查询所有一级分类
    getOneSubject() {
      subject.getSubjectList().then((reponse) => {
        // console.log(reponse);
        this.subjectOneList = reponse.data.list;
      });
    },

    //查询所有的讲师
    getListTeacher() {
      course.getListTeacher().then((reponse) => {
        // console.log(reponse);
        this.teacherList = reponse.data.items;
      });
    },
    addCourse() {
      course.addCourseInfo(this.courseInfo).then((reponse) => {
        this.$message({
          message: "添加课程信息成功",
          type: "success",
        });
        this.$router.push({ path: "/course/chapter/" + reponse.data.courseId });
      });
    },
    updateCourse() {
      course.updateCourseInfoId(this.courseInfo).then((reponse) => {
        this.$message({
          message: "修改课程信息成功",
          type: "success",
        });
        this.$router.push({ path: "/course/chapter/" + this.courseId });
      });
    },
    saveOrUpdate() {
      if (this.courseInfo.id) {
        this.updateCourse();
      } else {
        this.addCourse();
      }
    },
  },
};
</script>
<style scoped>
.tinymce-container {
  line-height: 29px;
}
</style>